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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b36ecdf67d51ff29507ad5dd1d444ab8b068769cd7ad311cdd349f59ba4fa14' 
  AND token = 'TleGd7Byt+geRpVmf6BegRmFO0Q48aL3oQ1Bw68Ahzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}